Gas extraction device driven by wind pressure

Abstract

The utility model discloses a wind pressure driven gas extraction device which comprises an extraction pipeline, a venturi tube and a discharge pipeline, and the venturi tube is connected between the extraction pipeline and the discharge pipeline. The Venturi tube comprises an inlet section and a diffusion section, the inlet section and the diffusion section are arranged in a relatively movable and matched mode, a first contraction section is arranged at the end of the inlet section, a second contraction section is arranged at the end of the diffusion section, the first contraction section and the second contraction section are arranged in a sleeved mode, and the position between the first contraction section and the second contraction section can move relatively. According to the wind pressure driven gas extraction device provided by the utility model, the Venturi tube is designed into a structure that the inlet section and the diffusion section can move relative to each other, and the length of the throat part of the Venturi tube is dynamically adjusted by utilizing the sleeving matching of the first contraction section and the second contraction section, and can be adjusted according to the wind pressure fluctuation of a main ventilation system of a mine; the extraction device can adapt to and adjust the extraction pressure change, and the stable extraction strength can be maintained.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas discharge device technical field especially relates to a kind of wind pressure drive gas extraction device. BACKGROUND

[0002] Goaf gas control is one of the core problems of coal mine safety production. With the increase of mining depth and the expansion of goaf area, gas continues to accumulate in the fissure zone of goaf, which is easy to form a local high-concentration gas enrichment area, and there are major safety hazards such as spontaneous combustion, explosion and suffocation.

[0003] Traditional gas extraction technology mainly relies on high-power fixed extraction pump station or buried pipe negative pressure extraction, and generally relies on external power to drive high negative pressure extraction equipment, which has high energy consumption and complex equipment maintenance. Although some technologies use Venturi tube structure to strengthen gas flow, the design of fixed throat size limits the efficiency of negative pressure generation to a single working condition, which cannot adapt to the dynamic changes of the main ventilation system. When the ventilation system changes dynamically, it is difficult to match the extraction demand in real time, which may cause extraction efficiency fluctuation or gas concentration overrun. SUMMARY

[0004] The present application provides a kind of wind pressure drive gas extraction device, solve the technical problem that gas extraction device cannot match extraction pressure change in real time in prior art.

[0005] The present application provides a kind of wind pressure drive gas extraction device, the extraction device includes extraction pipeline, Venturi tube and discharge pipeline, the Venturi tube is connected between the extraction pipeline and discharge pipeline;

[0006] The Venturi tube includes an inlet section and a diffusion section, the inlet section is movably matched with the diffusion section, the end of the inlet section is provided with a first contraction section, the end of the diffusion section is provided with a second contraction section, the first contraction section and the second contraction section are sleeved, and the position between the first contraction section and the second contraction section is movable.

[0007] In some embodiments, the extraction device further includes an adjusting mechanism, and the adjusting mechanism includes:

[0008] A base;

[0009] A first fixed part, the inlet section is fixedly installed on the first fixed part, and the first fixed part is fixedly arranged on the base;

[0010] A movable part, the diffusion section is fixedly installed on the movable part;

[0011] An adjusting track, the first fixed part is fixedly arranged on the adjusting track, and the movable part is slidably arranged on the adjusting track;

[0012] A telescopic rod is fixedly installed on the base, a telescopic end of the telescopic rod is fixedly connected with the movable part, and the telescopic rod is operable to drive the second contraction section to move along the adjusting track.

[0013] In some embodiments, the adjusting mechanism further comprises a bellows and a second fixed part, one end of the bellows is connected with the outlet of the diffusion section, the other end of the bellows is connected with a discharge pipeline, the discharge pipeline is fixedly arranged on the base through the second fixed part, the movable part and the bellows are arranged between the first fixed part and the second fixed part, an end of the bellows away from the movable part is fixedly provided with an adjusting cone, the adjusting cone is arranged along the length direction of the bellows, and a tip end of the adjusting cone is arranged towards the diffusion section.

[0014] In some embodiments, a first impeller is rotatably arranged at the tip end of the adjusting cone, and the first impeller is arranged towards the diffusion section.

[0015] In some embodiments, a second impeller is rotatably arranged at the tip end of the adjusting cone, the second impeller is arranged towards the adjusting cone, the second impeller is located between the first impeller and the adjusting cone, and the first impeller and the second impeller are fixedly connected.

[0016] A plurality of air pipes are arranged inside the adjusting cone, the air pipes are connected with an external air compressor through pipelines, a humidifying nozzle is connected with each air pipe outlet of the adjusting cone, the humidifying nozzle is arranged towards the second impeller, and the humidifying nozzle blows the second impeller to rotate through high-pressure gas.

[0017] In some embodiments, a wind scooper is coaxially and fixedly arranged at the tip end of the adjusting cone, the humidifying nozzle is located inside the wind scooper, the wind scooper extends to the second impeller, and the wind scooper has a spacing with the second impeller.

[0018] In some embodiments, the extraction device further comprises a controller, an air pressure sensor and a gas concentration sensor, the air pressure sensor and the gas concentration sensor are arranged in the extraction pipeline, and the telescopic rod, the air pressure sensor and the gas concentration sensor are electrically connected with the controller.

[0019] In some embodiments, the extraction device further comprises a cyclone dust collector, and an outlet of the discharge pipeline is connected with an inlet of the cyclone dust collector.

[0020] In some embodiments, an outlet of the cyclone dust collector is connected with a molecular sieve tower.

[0021] In some embodiments, the dust exhaust pipe of the cyclone dust collector is provided with a plurality of dust removal nozzles for spraying air inward, the cyclone dust collector is provided with a gas storage tank outside, the gas storage tank is connected with an air compressor outside, the gas storage tank is connected with the dust removal nozzles through pipelines, and an electromagnetic valve is arranged on the pipelines between the gas storage tank and the dust removal nozzles.

[0022] The application has the following advantages:

[0023] The wind pressure driven gas extraction device has the advantages that the Venturi tube is designed as a structure in which the inlet section and the diffusion section are relatively movable, the dynamic adjustment of the throat length of the Venturi tube is realized by the sleeving cooperation of the first contraction section and the second contraction section, the extraction device can adapt to the adjustment of the extraction pressure change and can maintain stable extraction intensity, and the extraction device can be adjusted according to the wind pressure fluctuation of the main ventilation system of the mine, the first contraction section and the second contraction section are moved towards each other when the extraction negative pressure intensity of the ventilation system is small, the throat length of the Venturi tube is reduced to increase the air pressure of the exhaust pipeline, and the first contraction section and the second contraction section are moved away from each other when the extraction negative pressure intensity of the ventilation system is large, the throat length of the Venturi tube is increased to reduce the air pressure of the exhaust pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application.

[0025] Figure 1 It is a whole structure schematic view of the wind pressure driven gas extraction device provided by the present application.

[0026] Figure 2 It is a Venturi tube contraction state schematic view of the wind pressure driven gas extraction device provided by the present application.

[0027] Figure 3 It is a Venturi tube elongation state schematic view of the wind pressure driven gas extraction device provided by the present application.

[0028] Figure 4 It is a partial sectional view of the diffusion section of the Venturi tube.

[0029] Figure 5 It is a perspective view of the cooperation of the corrugated pipe and the exhaust pipeline in the wind pressure driven gas extraction device provided by the present application.

[0030] Figure 6 It is an internal structure schematic view of the corrugated pipe in the wind pressure driven gas extraction device provided by the present application.

[0031] Figure 7A connection state schematic diagram of a cyclone dust collector and a molecular sieve tower in a wind pressure driven gas extraction device provided in the present application is shown in the figure.

[0032] Figure 8 A connection state schematic diagram of a cyclone dust collector and a molecular sieve tower in a wind pressure driven gas extraction device provided in the present application is shown in the figure. Figure 7 A local enlarged view of A in the figure.

[0033] Figure 9 A circuit structure diagram of a wind pressure driven gas extraction device provided in the present application is shown in the figure.

[0034] Wherein,

[0035] 11, extraction pipeline; 12, Venturi tube; 121, inlet section; 122, diffusion section; 123, first contraction section; 124, second contraction section; 13, discharge pipeline;

[0036] 20, adjusting mechanism; 21, base; 22, first fixed part; 23, movable part; 24, adjusting track; 25, telescopic rod; 26, bellows; 27, second fixed part; 28, adjusting cone; 281, first impeller; 282, second impeller; 283, humidifying nozzle; 284, air duct;

[0037] 30, controller; 31, wind pressure sensor; 32, gas concentration sensor;

[0038] 40, cyclone dust collector; 401, ash discharge pipe; 41, molecular sieve tower; 42, ash removal nozzle; 43, gas storage tank; 44, electromagnetic valve; 45, annular pipeline. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications will also change accordingly.

[0041] In addition, the descriptions involving "first", "second" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0042] The technical problem that the gas extraction device in the prior art cannot match the change of extraction pressure in real time is solved by providing a wind pressure driven gas extraction device.

[0043] The technical solution in the embodiments of the present application is to solve the above technical problems, and the general idea is as follows:

[0044] As shown in Figures 1-4 The present application provides a wind pressure driven gas extraction device, which comprises an extraction pipeline 11, a Venturi tube 12 and an exhaust pipeline 13. The ventilator for gas extraction can be installed before the extraction pipeline 11 or after the exhaust pipeline 13. The Venturi tube 12 is connected between the extraction pipeline 11 and the exhaust pipeline 13. The extraction pipeline 11, the Venturi tube 12 and the exhaust pipeline 13 are made of stainless steel.

[0045] The Venturi tube 12 comprises an inlet section 121 and a diffusion section 122. The inlet section 121 and the diffusion section 122 are movably matched. The end of the inlet section 121 is provided with a first contraction section 123, and the end of the diffusion section 122 is provided with a second contraction section 124. The first contraction section 123 and the second contraction section 124 are sleeved, and the position between the first contraction section 123 and the second contraction section 124 is movable. Specifically, a sealing ring is arranged at the matching position of the first contraction section 123 and the second contraction section 124 to prevent gas leakage through the gap between the first contraction section 123 and the second contraction section 124.

[0046] By designing the Venturi tube 12 as a structure in which the inlet section 121 and the diffusion section 122 are relatively movable, and by using the sleeved connection of the first contraction section 123 and the second contraction section 124, dynamic adjustment of the throat length of the Venturi tube 12 is achieved, which can be adjusted according to the wind pressure fluctuation of the main ventilation system of the mine, when the extraction negative pressure intensity of the ventilation system is small, the first contraction section 123 and the second contraction section 124 are moved towards each other, the throat length of the Venturi tube 12 is reduced, so as to increase the air pressure of the exhaust pipeline 13, when the extraction negative pressure intensity of the ventilation system is large, the first contraction section 123 and the second contraction section 124 are moved away from each other, the throat length of the Venturi tube 12 is increased, so as to reduce the air pressure of the exhaust pipeline 13, so that the extraction device can adapt to the adjustment of the extraction pressure change and can maintain stable extraction intensity.

[0047] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings of the specification and the specific embodiments.

[0048] Preferably, as shown in the drawings, Figures 1-4 The extraction device further comprises an adjusting mechanism 20, the adjusting mechanism 20 comprises a base 21, a first fixed part 22, a movable part 23 and an adjusting track 24, the base 21 can be directly installed on the ground for different installation positions, or can be installed on the ground through a support, the inlet section 121 is fixedly installed on the first fixed part 22, and the first fixed part 22 is fixedly arranged on the base 21; the diffusion section 122 is fixedly installed on the movable part 23; the first fixed part 22 is fixedly arranged on the adjusting track 24, and the movable part 23 is slidingly arranged on the adjusting track 24; a telescopic rod 25 is fixedly installed on the base 21, in this embodiment, the telescopic rod 25 is an electric push rod or a pneumatic piston, and the telescopic end of the telescopic rod 25 is fixedly connected with the movable part 23; the telescopic rod 25 is operable to drive the second contraction section 124 to move along the adjusting track 24.

[0049] Of course, a ball screw telescopic structure can also be used instead of the telescopic rod 25, or a cam structure can also be used, in general, the movable part 23 is driven to move on the adjusting track 24 through the above structure, which belongs to the prior art, and the working principle thereof will not be described again here.

[0050] When it is necessary to adjust the relative position between the first converging section 123 and the second converging section 124, the electric push rod is extended or retracted, the electric push rod drives the movable part 23 to move along the adjusting track 24, thereby changing the position of the diffuser section 122 on the base 21, so that the length of the throat composed of the first converging section 123 and the second converging section 124 is adjusted, the relative position between the inlet section 121 and the diffuser section 122 is changed, so that the device can adjust the extraction efficiency according to the actual working condition, and the ability of the device to use different working environments is improved. And because the inlet section 121 and the diffuser section 122 are detachable structures, it is convenient to disassemble and replace each part, thereby reducing the maintenance cost. Specifically, the diameter of the first converging section 123 is smaller than the diameter of the second converging section 124, which reduces the wear of the second converging section 124 caused by the gas entering the inlet section 121, reduces the flow resistance of the gas, makes the gas flow more smoothly in the second converging section 124 and the diffuser section 122, and prolongs the service life of the Venturi tube 12.

[0051] Preferably, the adjusting mechanism 20 further comprises a bellows 26 and a second fixed part 27. In this embodiment, the bellows 26 is a stainless steel bellows 26. One end of the bellows 26 is connected with the outlet of the diffuser section 122, and the other end of the bellows 26 is connected with the exhaust pipeline 13. The exhaust pipeline 13 is fixedly arranged on the base 21 through the second fixed part 27. The movable part 23 and the bellows 26 are arranged between the first fixed part 22 and the second fixed part 27. One end of the bellows 26 away from the movable part 23 is fixedly provided with an adjusting cone 28. The adjusting cone 28 is arranged along the length direction of the bellows 26. The tip of the adjusting cone 28 is arranged towards the diffuser section 122. The tail end of the adjusting cone is fixedly connected with the exhaust pipeline 13. The adjusting cone is made of aluminum alloy or titanium alloy, which not only reduces the weight, but also makes the adjusting cone have good mechanical properties.

[0052] In the adjusting mechanism 20 adjusts the relative position between the inlet section 121 and the diffusion section 122, because the position between the first fixed part 22 and the second fixed part 27 is constant, combined with the structure of the bellows 26, the position relationship between the diffusion section 122 and the adjusting cone changes, the diffusion section 122 and the adjusting cone play a role in adjusting the flow path and flow speed of the airflow, when the extraction negative pressure intensity of the ventilation system is small, the first contraction section 123 and the second contraction section 124 are moved towards each other, the diffusion section 122 and the adjusting cone are away from each other, the airflow passage area is increased, the length of the throat of the Venturi tube 12 is reduced, and the air pressure of the exhaust pipeline 13 is increased; when the extraction negative pressure intensity of the ventilation system is large, the first contraction section 123 and the second contraction section 124 are moved away from each other, the diffusion section 122 and the adjusting cone are close to each other, the airflow passage area is reduced, the length of the throat of the Venturi tube 12 is increased, and the air pressure of the exhaust pipeline 13 is reduced, which can make the extraction device further adapt to the change of the extraction pressure.

[0053] Further, as shown in Figures 4-6 The first impeller 281 is arranged at the head end of the adjusting cone 28, and the first impeller 281 is arranged towards the diffusion section 122. When the airflow in the diffusion section 122 is exhausted, part of the airflow blows the first impeller 281 to rotate, so that the first impeller 281 changes the direction of the part of the airflow to radial diffusion, so that the airflow can be concentrated between the outer ring of the first impeller 281 and the exhaust pipeline 13, and the pressure of the airflow is increased. The exhaust effect of the airflow is improved. Of course, in this embodiment, there may be a case that the airflow cannot blow the first impeller 281 to rotate, so this embodiment is not the best solution.

[0054] Further, as shown in Figures 4-6 The second impeller 282 is arranged at the head end of the adjusting cone 28, and the second impeller 282 is arranged towards the adjusting cone 28. The second impeller 282 is located between the first impeller 281 and the adjusting cone 28, and is fixedly connected with the first impeller 281 and the second impeller 282, so that the first impeller 281 and the second impeller 282 can rotate synchronously. The first impeller 281 and the second impeller 282 are turbine impellers, which can convert axial airflow into radial airflow, so that the airflow flows more concentratedly. The rotating directions of the first impeller 281 and the second impeller 282 after being blown by the airflow are the same.

[0055] The adjusting cone 28 is internally provided with a plurality of air pipes connected with an external air compressor through a pipeline, each air pipe outlet on the adjusting cone 28 is connected with a humidifying nozzle 283, the humidifying nozzle 283 is arranged towards the second impeller 282, the humidifying nozzle 283 drives the second impeller 282 to rotate through high-pressure gas, a certain amount of water is stored in the air compressor, when the air compressor supplies air to the humidifying nozzle 283, the humidifying nozzle 283 sprays steam-water mixture, the steam-water mixture blows to the second impeller 282 to drive the second impeller 282 to rotate, the second impeller 282 rotates together with the first impeller 281, the first impeller 281 guides the airflow discharged from the diffusion section 122 to the radial outside, the second impeller 282 guides the steam-water mixture sprayed from the humidifying nozzle 283 to the radial outside, the airflow guided by the first impeller 281 and the second impeller 282 is mixed, so that the airflow can be humidified, the steam-water mixture sprayed from the humidifying nozzle 283 can provide power for the first impeller 281 and the second impeller 282, further improve the airflow discharge effect, and the dust in the airflow can be agglomerated, so that the dust can be removed to a certain extent.

[0056] Further, as shown in Figure 4 , Figure 5 The tip of the adjusting cone 28 is coaxially fixedly provided with a wind guide 284, the humidifying nozzle 283 is located inside the wind guide 284, the wind guide 284 extends to the second impeller 282, and the wind guide 284 has a spacing with the second impeller 282, the wind guide 284 is a cylindrical structure, the end of the wind guide 284 exceeds the humidifying nozzle 283, and the wind guide 284 is close to the second impeller 282, so as to better guide the steam-water mixture sprayed from the humidifying nozzle 283, so that the steam-water mixture can act on the second impeller 282 more, and provide sufficient power for the second impeller 282.

[0057] Preferably, as shown in Figure 9 The extraction device further comprises a controller 30, an air pressure sensor 31 and a gas concentration sensor 32, the air pressure sensor 31 and the gas concentration sensor 32 are arranged in the extraction pipeline 11, the telescopic rod 25, the air pressure sensor 31 and the gas concentration sensor 32 are electrically connected with the controller 30, the controller 30 adopts PLC control, the air pressure sensor 31 can adopt a mechanical air pressure sensor 31, and can also select a capacitive, piezoresistive or ultrasonic air pressure sensor 31, the gas concentration sensor 32 adopts a semiconductor gas concentration sensor 32 or an infrared absorption type sensor, the housings of the air pressure sensor 31 and the gas concentration sensor 32 are selected to be made of stainless steel or engineering plastic, and are sealingly arranged to prevent dust from entering the inside of the sensors.

[0058] The wind pressure sensor 31 and the gas concentration sensor 32 are installed in the extraction pipeline 11 to monitor the wind pressure and the gas concentration in the pipeline in real time. The controller 30 receives data from the wind pressure sensor 31 and the gas concentration sensor 32, analyzes the current working condition, and automatically adjusts the position of the telescopic rod 25 according to the preset to change the relative position between the diffusion section 122 and the exhaust pipeline 13, optimize the airflow channel, and improve the extraction efficiency. It should be noted that the controller 30 receives data from the wind pressure sensor 31 and the gas concentration sensor 32, simply adjusts the telescopic length of the telescopic rod 25, which is a conventional operation in the prior art and does not involve improvements to the control method. Therefore, it is only an application of the structure, and the specific control principle does not need to be explained in this embodiment. For example, in a certain mine, the preset target working condition is that the wind pressure is 700-900 Pa, and the gas concentration should be maintained at 40%-50%. When the gas concentration is 35% lower than the preset value, it is determined according to the preset that the insufficient extraction negative pressure leads to a decrease in gas enrichment efficiency. The throat length of the Venturi tube 12 is adjusted according to the preset. After the throat length is reduced, the Venturi effect is enhanced, the extraction negative pressure is enhanced, and the gas concentration is reduced.

[0059] Another preferred embodiment, as shown in Figures 7-9 The extraction device further comprises a cyclone dust collector 40, and the outlet of the exhaust pipeline 13 is connected to the inlet of the cyclone dust collector 40.

[0060] Further, the outlet of the cyclone dust collector 40 is connected to a molecular sieve tower 41. The bottom layer of the molecular sieve tower 41 is a zeolite molecular sieve with a pore size of 0.4 nm and adsorbs H2O / CO2. The upper layer is a MOFs material that adsorbs CH4. The molecular sieve carrier adopts a ceramic honeycomb structure with a pore size of 1 mm and a specific surface area of >800 m2 / g.

[0061] When the gas containing dust particles enters the cyclone dust collector 40, an outer spiral airflow is first formed inside the cyclone dust collector 40. The spiral airflow flows downward along the inner wall of the cyclone dust collector 40. After the outer vortex airflow reaches the bottom of the cone, the dust-containing gas falls through the ash discharge pipe 401. About 85%-90% of the clean gas reversely rotates upward along the central axis to form an upward rotating inner vortex. The rotational angular velocity decreases from the center to the edge. The clean gas is discharged from the axial outlet pipe at the top and enters the cyclone dust collector 40. Due to the doping of water vapor in the exhaust pipeline 13, the dust contacts and agglomerates with the water vapor. The dust is more easily agglomerated in the high-speed rotation of the cyclone dust collector 40 and falls into the outlet of the cyclone dust collector 40. The gas discharged from the cyclone dust collector 40 is purified by the molecular sieve tower 41. Finally, the high-purity gas enters the gas storage tank 43.

[0062] Additionally, the cyclone dust collector 40 may also have multiple ash removal nozzles 42 installed on the side of its ash discharge pipe, which spray air inwards. An air storage tank 43 is installed outside the cyclone dust collector 40. The air storage tank 43 is connected to an external air compressor. The air storage tank 43 is connected to the ash removal nozzles 42 via a pipeline. A solenoid valve 44 is installed on the pipeline between the air storage tank 43 and the ash removal nozzles 42. The solenoid valve 44 is a one-way valve, which allows the gas in the air storage tank 43 to flow only towards the ash removal nozzles 42. The ash removal nozzles 42 are connected to an annular pipeline 45 and are connected to the air storage tank 43 through the annular pipeline 45, so that the gas in the air storage tank 43 can enter the ash removal nozzles 42 synchronously.

[0063] After prolonged use, ash clumps may accumulate and clog the ash discharge pipe 401 of the cyclone dust collector 40, leading to reduced ash removal efficiency. An air compressor pressurizes the air tank 43 to maintain a certain air pressure reserve. Pressurization stops when the air pressure in the air tank 43 reaches a preset value. When cleaning of the ash discharge pipe 401 is required, the solenoid valve 44 can be set to automatically open at regular intervals. High-pressure gas from the air tank 43 is then introduced into the ash removal nozzle 42. The nozzle 42 ejects high-pressure gas, and the sufficient air pressure disperses the ash clumps in the ash discharge pipe 401, causing them to detach and be discharged. This effectively solves the ash discharge pipe clogging problem of the cyclone dust collector 40, ensuring stable operation of the cyclone dust collector 40. Of course, controlling the solenoid valve 44 to automatically open at regular intervals via the controller 30 is a conventional technique in the prior art, and its control principle will not be explained in this embodiment.

[0064] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0065] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A wind pressure driven gas extraction device, characterized by, The extraction device comprises an extraction pipeline, a Venturi tube and an exhaust pipeline, the Venturi tube is connected between the extraction pipeline and the exhaust pipeline; The Venturi tube comprises an inlet section and a diffusion section, the inlet section is movably matched with the diffusion section, an end of the inlet section is provided with a first contraction section, an end of the diffusion section is provided with a second contraction section, the first contraction section is sleeved with the second contraction section, and the first contraction section and the second contraction section are movable relative to each other.

2. The wind pressure-driven gas extraction device according to claim 1, wherein The extraction device further comprises an adjusting mechanism, the adjusting mechanism comprises: a base; a first fixed part, the inlet section is fixedly installed on the first fixed part, and the first fixed part is fixedly arranged on the base; a movable part, the diffusion section is fixedly installed on the movable part; an adjusting track, the first fixed part is fixedly arranged on the adjusting track, and the movable part is slidingly arranged on the adjusting track; a telescopic rod, the telescopic rod is fixedly installed on the base, a telescopic end of the telescopic rod is fixedly connected with the movable part, and the telescopic rod is operable to drive the second contraction section to move along the adjusting track.

3. The wind pressure driven gas extraction device according to claim 2, wherein The adjusting mechanism further comprises a bellows and a second fixed part, one end of the bellows is connected with an outlet of the diffusion section, the other end of the bellows is connected with the exhaust pipeline, the exhaust pipeline is fixedly arranged on the base through the second fixed part, the movable part and the bellows are arranged between the first fixed part and the second fixed part, one end of the bellows away from the movable part is fixedly arranged with an adjusting cone, the adjusting cone is arranged along the length direction of the bellows, and a tip end of the adjusting cone is arranged towards the diffusion section.

4. The wind pressure-driven gas extraction device according to claim 3, wherein A first impeller is rotationally arranged at a head end of the adjusting cone, and the first impeller is arranged towards the diffusion section.

5. The wind pressure driven gas extraction device according to claim 4, wherein A second impeller is rotationally arranged at the head end of the adjusting cone, the second impeller is arranged towards the adjusting cone, the second impeller is located between the first impeller and the adjusting cone, and the first impeller is fixedly connected with the second impeller. A plurality of air tubes are arranged in the adjusting cone, the air tubes are connected with an external air compressor through pipelines, each air tube outlet on the adjusting cone is connected with a humidifying nozzle, the humidifying nozzle is arranged towards the second impeller, and the humidifying nozzle drives the second impeller to rotate through high-pressure gas.

6. The wind pressure driven gas extraction device according to claim 5, wherein A wind guide cylinder is coaxially and fixedly arranged at the tip end of the adjusting cone, the humidifying nozzle is located in the wind guide cylinder, the wind guide cylinder extends to the second impeller, and the wind guide cylinder has a spacing with the second impeller.

7. The wind pressure driven gas extraction device according to claim 2, wherein The extraction device further comprises a controller, an air pressure sensor and a gas concentration sensor, the air pressure sensor and the gas concentration sensor are arranged in the extraction pipeline, and the telescopic rod, the air pressure sensor and the gas concentration sensor are electrically connected with the controller.

8. The wind pressure driven gas extraction device according to claim 1, wherein The extraction device further comprises a cyclone dust collector, an outlet of the exhaust pipeline is connected with an inlet of the cyclone dust collector.

9. The wind pressure driven gas extraction device according to claim 8, wherein An outlet of the cyclone dust collector is connected with a molecular sieve tower.

10. The wind pressure driven gas extraction device according to claim 8, wherein The ash discharge pipe side of the cyclone dust collector is provided with a plurality of ash removal nozzles for spraying air to the inside, the outside of the cyclone dust collector is provided with a gas storage tank, the gas storage tank is connected with an air compressor outside, the gas storage tank is connected with the ash removal nozzles through pipelines, and an electromagnetic valve is arranged on the pipelines between the gas storage tank and the ash removal nozzles.

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